package com.itheima.health.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author cfr
 * @date 2021/12/29
 * @TIME:10:20
 */
@WebFilter(filterName = "LoginFilter", urlPatterns = "/*")
@Slf4j
public class LoginFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/validateCode/send4Login.do",
                "/member/login.do",
                "/pages/login.html",
                "/css/**",
                "/fonts/**",
                "/img/**",
                "/plugins/**",
        };

        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                //放行
                filterChain.doFilter(request, response);
                return;
            }
        }
        //4、判断登录状态，如果已登录，则直接放行
        Integer member = (Integer) request.getSession().getAttribute("member");
        if (member == null) {
            //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
            response.sendRedirect("/pages/login.html");
            return;
        }
        filterChain.doFilter(request, response);
    }
}
